The Eaton Crouse-Hinds Series Compression Coupling Concrete Tight 669 RT is a rigid 4-inch conduit fitting designed for electrical metallic tubing (EMT). It features a through-hole mounting style and a silver color. This compression coupling is specifically designed for providing a secure and reliable connection in electrical installations. Ideal for use in various industrial and commercial settings, it offers a durable and flexible solution for conduit fittings.